Shut down the PC
Unplug the power cable and all peripherals
Move the PC to a clean, well-lit area
Ground yourself to avoid static electricity
Open the case
Use compressed air to blow out dust
Hold fans in place while cleaning them
Clean dust from heatsinks, vents, and filters
Wipe surfaces with a dry microfiber cloth
Use a soft brush for stubborn dust
Clean the power supply vents from the outside
Remove and clean dust filters
Clean the monitor with a microfiber cloth
Clean the keyboard and mouse
Reassemble the PC
Plug everything back in
Power on and check that all fans are working properly